养护龄期对水泥混凝土性能和微观结构的影响
刘 鹏h ， 余志武 。， 陈令坤
(1．中南大学土木建筑学院，湖南长沙410075；
2．中南大学高速铁路建造技术国家工程实验室，湖南长沙410075)
摘要：研究养护龄期对磷铝酸盐水泥混凝土抗压强度、表面透气和吸水性能影响，利用多种测定仪
对混凝土水化产物物相组成、微观结构形貌、电性能和孔结构特性等进行了分析．此外，还分析了
不同种类水泥早期水化特性，并解析了磷酸盐水泥具有早强和高强特性的缘由．结果表明：养护龄
期对混凝土表观性能和微观结构影响较大，混凝土表观性能与微观结构之间存在密切联系；随着
养护龄期延长，混凝土抗压强度不断增加，表面透气和吸水系数不断降低，其微观结构更加致密，
孔的分形维数降低，这是由于生成的水化产物不断增多，减少了混凝土总孔隙含量造成的．磷铝酸
盐水泥混凝土性能优于相同龄期的硅酸盐水泥混凝土，这是由于2种水泥属于不同体系，其水化生
成物和反应机理不同．
关键词：磷铝酸盐水泥；表面；透气；吸水；连通孔；养护龄期；微观结构
中图分类号：TU528．07 文献标志码：A doi：10．3969／j．issn．1007—9629．2012．05．026
Influence of Curing Age on Properties and M icro Structure of Concrete
LIU Peng 。yU Zhi一 ， CH EN Ling—kun '
(1．School of Civil Engineering and Architecture，Central South University，Changsha 410075，China；2．National
Engineering Laboratory for High Speed Railway Construction，Central South University，Changsha 410075，China)
Abstract：Influence of curing age on compressive strength，air permeability and water absorptivity of phos—
phoaluminate cement concrete(PALC)was investigated．The phase composition and morphology of hydra—
tion products，electrical properties，pore structure and distribution of concrete were analyzed by various
instruments．In addition，the hydration heat test and the cause for early—high strength of PAC were inves—
tigated as well introduced to test the hydration heat and explain the cause for early—high strength of PAC．
The results show that the effect of curing age on the apparent performance and micro——structure of the con
crete is great，and they are related closely．W ith age，the com pressive strength becom es higher，air perm e—
ability and absorptivity of concrete decrease．The corresponding fractal dimension of the pore and the mi—
cro—structure are changed as wel1．The reason for that is that the more hydration products are generated
and the porosity of the concrete is reduced．Furthermore，the properties of phosphoaluminate cement con—
crete are better than that of Portland cement because of different hydration products and mechanism．
Key words：phosphoaluminate cement(PALC)； surface；air permeability；absorptivity；interconnected
pore；curing age；micro structure

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